Trilobite collecting in Colorado Rockies - Ordivician (Manitou Dolomite) - 2/1/2003

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Appears to be pygidium, or tail section of trilobite. Probably lost during molt (when trilobite sheds its exoskeleton).
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Appears to be pygidium, or tail section of trilobite. Probably lost during molt (when trilobite sheds its exoskeleton).